Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb590fcb6b7d949e…

MALICIOUS

PDF

209.6 KB Created: 2021-06-25 23:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b1b3fa1d8d9c8b697260d3db7cc5128a SHA-1: aa6b55cd0e41a63be22e92bf80a8c693c4e98a61 SHA-256: cb590fcb6b7d949ef952c4ec3a534c5c2ac24a63e65fd6caf80c871726246f6e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, with at least one URL being algorithmically generated, indicating a likely attempt to host malicious content. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests these links are part of a campaign to distribute malware or phish for credentials. No scripts were extracted, but the presence of external links and the ML classifier's high confidence score support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9703

Heuristics 7

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://youandisagenix.com/ckfinder/userfiles/files/zigonolikivorenalero.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/q6a46bgpl9rmojhhihm7jnp689/26595985447.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97893c4d0---gigafuxivufex.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/18171382158.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/88623974240.pdfIn PDF document text
    • https://cecprint.com/images/file/53718354727.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/gamutibaxojatanaliliz.pdfIn PDF document text
    • http://lyshiying.com/d/files/162054617.pdfIn PDF document text
    • https://aspirans.com/files/file/75576722044.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/53828164256.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096693e61e97---wodajapikodop.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607858ce5d213---wakoxu.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a430423f4efd29ac23e4044f78d4e6d/muzokekutotonopuvav.pdfIn PDF document text
    • https://nevisnews.com/userfiles/jikirefudunukapu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ca2823d40a883fec4e683d83c6aa329/32355729153.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/1a2cqj5err61ccol8ck6hk4445/gonurapilepemudogunevudu.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/bepuwi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b45bcd5ef1f---sijexoxidufoketo.pdfIn PDF document text
    • http://eibich.de/layout/bilder/file/jupubunixovawuwoxu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vdvljakk37e8ig13fqss2otg90/sazuxunu.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/10239654965.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ef21ee35e---zupukafibojezeta.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/jetipotewezawamunifimu.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/94342875927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=eyes+on+fire+blue+foundation+meaningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F050 11032 bytes
SHA-256: ef3dbb975783333eb4e452c918bf6c37a61c3bb0450554eccc8ee69a1a888f13
font_02_sfnt_off000309cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x309CC 18200 bytes
SHA-256: 72b17ed732909fb46348594597ef75d9781a3c5a482da54739290d5e9640d9b1